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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5cef8303b8a9fb42d24b14deb4109b9d83eba864585ddaf0af4c9e08825a98' 
  AND token = 'veNsgqN8q6ZsksAn/wwvrs1BWN+Z9Y3762vDYvZ96/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}